JPH0719625A - Driving system for vibrating compressor - Google Patents

Abstract

PURPOSE:To hold an amplitude of a driving voltage constant by providing a driving circuit having a switch driving circuit which is operated according to output signals of a microprocessor and a binary counter based on a signal detected by a temperature detector. CONSTITUTION:Data of output ports based on detection signals of temperature detectors 4, 5, respectively are set by 4-bit microprocessor 1. Contents of data of output ports of a binary counter 32 for logically converting the data of the ports and a 4-bit microprocessor are logically synthesized by a logical& synthesizer 37. A flip-flop 33 is operated by an output of a NOR circuit 34 for resetting the counter 32 with respect to the logical output data. Transistors TR1 TR2 are driven by this operation and a driving power having a predetermined frequency to a vibrating compressor 2 is generated. Accordingly, a control with high frequency accuracy can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system for an oscillating compressor, and more particularly, to a drive control device configured to drive the compressor by using drive power having a predetermined frequency determined according to the refrigerant temperature. High versatility but slow operation speed, for example, 4-bit microprocessor with high frequency accuracy,
The present invention relates to a drive system of a vibration compressor capable of performing phase control.

[0002]

2. Description of the Related Art Generally, a gaseous refrigerant is compressed and liquefied by using an oscillating compressor, and cooling is performed by utilizing heat of vaporization when the liquefied refrigerant is vaporized. The refrigerator is known. As a drive control device for a vibration type compressor used in the refrigerator, a device as shown in FIG. 5 is conventionally known.

In FIG. 5, reference numeral 1 in the drawing is a control unit, 2
Is a vibration compressor, 3 is a transformer, 4 is a first temperature detector (T
s), 5 is a second temperature detector (Td), 6 is a thermo device, 6'is a volume, 11 and 12 are temperature-voltage conversion units, 13 is a calculation unit, 14 is a drive circuit, 15 is an evaporator temperature comparison , 16 is a transformer, 17 is an AC detector, 18 is a surge absorption circuit, 19 is an overcurrent detection circuit, 2
0 and 21 are relays, 22 and 23 are AND circuits, and 24 and 2
Reference numeral 5 is an OR circuit, 26 is an inverter, 27 and 28 are diodes, 29 is a shunt, and TR ₁ and TR ₂ are switching transistors.

The first temperature detector (Ts) 4 detects the temperature of the evaporator of the refrigerator (not shown), and the second temperature detector (Td) 5 detects the temperature of the wire condenser of the refrigerator (not shown). To detect.

The thermo device 6 is for setting the temperature inside the refrigerator, and the temperature inside the refrigerator is set according to the setting of the volume 6'provided in the thermo device 6.

The temperature-voltage converters 11 and 12 convert the signals detected by the first temperature detector (Ts) 4 and the second temperature detector (Td) 5 into predetermined electric signals. is there.

The calculation unit 13 is provided with the temperature-voltage conversion unit 11 described above.
It is for generating a voltage corresponding to the frequency at which the vibration compressor 2 is driven in the resonance state, based on the electric signal converted by and 12.

The drive circuit 14 supplies a drive signal having a frequency corresponding to the voltage supplied from the arithmetic unit 13 to the transistors TR ₁ and TR ₂ in the figure so that the DC power supply (DC) shown in FIG. The primary winding has a so-called rectangular wave shape, and is for supplying current in a manner in which the windings having different polarities are alternately switched. 2 of the transformer 3
The AC voltage obtained from the secondary winding is supplied to the vibration compressor 2, and the vibration compressor 2 is always driven in a state of resonance, that is, driven with maximum efficiency.

The evaporator temperature comparator 15 has the
The signal of the set temperature in the refrigerator set in the room 6 '
And the first temperature detecting the temperature of the evaporator
Signal from the detector 4 (output signal of the temperature-voltage conversion unit 11
No.) and the set temperature of the thermo device 6 side
When the temperature on the evaporator side becomes low, the logic
Output "L". The output of the logic "L" is a negative input terminal
To the drive circuit 14 via the OR circuit 25 having
It becomes a stop signal, and a reset signal is sent via the AND circuit 22.
The relay 21 contacts are turned off and the relay 21
Langista TR₁, TR ₂Supply of DC power to
Let

The transformer 16 is a commercial power source (A
When it is connected to C), it lowers the voltage of the commercial power source for its detection, and drops the voltage of the commercial power source and supplies it to the AC detector 17 connected to the secondary side.

The AC detector 17 detects whether or not commercial power is input. When the commercial power is input,
Outputs logic "H". The logic "H" serves as a stop signal to the drive circuit 14 via the OR circuit 25, and turns off the contact of the relay 21 via the AND circuit 22 so that the transformer 3, that is, the transistor TR via the relay 21. _1, thereby interrupting the supply of DC power to TR _2. Further, the contact of the relay 20 is turned on via the AND circuit 23, and AC power is supplied to the transformer 3 via the relay 20.

The surge absorbing circuit 18 absorbs the surge voltage of the input DC power supply and supplies the DC power to the drive circuit 14, and when the voltage of the input DC power supply is higher than a predetermined voltage, the logic """H" is output. The logic “H” causes the drive circuit 14 via the OR circuit 24 to control the outputs of the transistors TR ₁ and TR ₂ and control the stroke of the vibration compressor 2.

The overcurrent detection circuit 19 detects an overcurrent flowing through the transistors TR ₁ and TR ₂ together with the shunt 29. When the overcurrent detection circuit 19 detects an overcurrent, the drive circuit 14 receives the transistor TR _1. , TR
An output off latch signal for stopping the operation of ₂ is output to prevent damage to the transistors TR ₁ , TR _2, etc.

In the conventional example shown in FIG. 5 described above,
The frequency and voltage value of the drive voltage supplied to the vibration compressor 2 are controlled based on the outputs of the temperature-voltage converters 11 and 12, that is, the temperature and input voltage of the evaporator and wire condenser of the refrigerator. .

Since the vibration compressor 2 shown in FIG. 5 uses resonance of a spring, depending on the frequency of the driving voltage,
Its output and efficiency change considerably. Therefore, the frequency accuracy is required to be within ± 0.2 Hz.

Further, the vibration compressor 2 is controlled by the discharge pressure and the suction pressure.
The amplitude of the piston of changes. For example, when the discharge pressure decreases, the phenomenon of valve hitting occurs. Therefore, the phase control of the inverter is performed, but a considerable output changes when the duty ratio is 2 to 3%.

FIG. 6 shows a configuration diagram of a conventional inverter portion, and the accuracy control of the frequency ± 0.2 Hz has been performed by the circuit configuration of FIG.

[0018]

However, in the configuration of the conventional drive control device shown in FIG. 5, even if the frequency of the drive voltage is oscillated at, for example, 50 Hz, 50-0.2 =
The difference from 49.8 Hz is only 80 μsec in one cycle and 40 μsec in half cycle. In this case, if a microprocessor is used for the drive circuit 14, the program will run in 40 μsec, so the operating speed cannot be kept up with a highly versatile 4-bit microprocessor.
There is a drawback that an 8-bit or 16-bit microprocessor capable of high speed operation must be used.

Also in terms of phase control, in the configuration of the conventional drive control device shown in FIG. 5, the drive voltage frequency is 50 Hz, and the duty ratio is 80% to 78%.
When changing to, a basic period of 200 μsec is required. In this case, if a microprocessor is used for the drive circuit 14, the program will run in 200 μsec. Therefore, the operation speed cannot be kept up with a highly versatile 4-bit microprocessor, and 8-bit or 16-bit operation that enables high-speed operation is possible. There was a drawback that a bit microprocessor had to be used.

An object of the present invention is to solve the above-mentioned drawbacks and a highly versatile, for example, 4-bit microprocessor is used to satisfy frequency accuracy within ± 0.2 Hz even if the operating speed is slow, Another object of the present invention is to provide a drive system of a vibration compressor capable of phase control so that the magnitude of drive voltage is kept constant.

[0021]

In order to achieve the above object, the drive system of the vibration compressor according to the present invention corresponds to a temperature detector for detecting the refrigerant temperature and a signal detected by the temperature detector. And a control unit that controls the drive power of a predetermined frequency determined by the first and second switching elements to be generated, and the drive power of the predetermined frequency generated by the control unit is used for the vibration type compressor. In a driving method of a vibration compressor configured to be driven in a substantially resonant state, the control unit sets data in an output port of an open collector based on a signal detected by the temperature detector. A low-speed microprocessor, a binary counter that counts a clock of a predetermined frequency, and the data set in the output port of the open collector and the bypass Based on the count content of the recounter, a logical synthesis circuit for synthesizing the data of the corresponding bit number of the output port, and a NOR for the data corresponding to each output port of the logical synthesis circuit determined by the output of the binary counter, A drive circuit having a NOR circuit for resetting the binary counter with the output signal and a switching drive circuit for operating the first and second switching elements respectively with the output signal of the NOR circuit is provided, and the frequency accuracy is ± 0. It is possible within 2Hz.

In order to enable the phase control, the control unit has a low-speed microprocessor in which data is set in the output port of the open collector based on the signal detected by the temperature detector, and a predetermined operation. A binary counter that counts the frequency clock, a logic synthesis circuit that synthesizes data of the number of bits corresponding to the output port from the data set in the output port of the open collector and the contents of the binary counter, and the binary counter of the binary counter. A NOR circuit for taking the NOR of the data corresponding to each output port of the logic synthesis circuit defined by the output and resetting the binary counter with the output signal, and the first and second circuits based on the output signal of the NOR circuit
Each of the switching elements is operated, and a drive circuit including a switching drive circuit that resets the binary counter at a predetermined timing is provided to perform phase control.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of a driving system for a vibration compressor according to the present invention. It is a tight fit.

In the figure, the same components as those in FIG. 5 are designated by the same reference numerals, 31 is a 4-bit microprocessor (MP), 32 is a binary counter, 33 is a flip-flop circuit, and 34 is a NOR circuit. , 35 is an inverter circuit, and 37 is a logic synthesis circuit.

The embodiment shown in FIG. 1 has basically the same structure as the conventional example shown in FIG. 5 described at the beginning of the specification of the present application, but it operates at a lower speed than the conventional example shown in FIG. The bit microprocessor 31 can ensure frequency accuracy within ± 0.2 Hz. Therefore, in FIG.
The description of the operation overlapping with the illustrated conventional example is omitted, and the operation of ensuring the frequency accuracy within ± 0.2 Hz will be described.

In FIG. 1, for example, 5
Resonance frequency control signal of 0Hz is a 4-bit microprocessor.
When input to the processor 31, the 4-bit microprocessor
Output port A of service 31₀Through A₈Is shown in Figure 3 (I)
Output port data is set. 4 bits here
Output port A of the microprocessor 31₀Through A ₈
Is an open collector, and H in the figure is described later.
The output of the binary counter 32
There is a possibility of logical conversion in the path 37.

On the other hand, a basic clock (CK) of, for example, 48 KHz is sent from the 4-bit microprocessor 31 to the binary counter 32, and the binary counter 32 counts the basic clock of 48 KHz. Each binary output of the binary counter 32 is a logic synthesis circuit 37.
The corresponding output ports A ₀ to A _{8 of the} 4-bit microprocessor 31 through the respective inverter circuits 35 and resistors in the
, The output port of the 4-bit microprocessor 31 is H, and the binary counter 32
When the corresponding binary output of H is H, the H of the output port of the 4-bit microprocessor 31 is converted to logic L.

Therefore, when the binary output of the binary counter 32 has the same logic as the output port of the 4-bit microprocessor 31, that is, the count value, the NOR circuit 3
The H signal is output from 4. This H signal triggers the flip-flop circuit 33 and resets the binary counter 32. As a result, the binary counter 32 restarts counting anew. The H signal is output again from the NOR circuit 34, and the flip-flop circuit 33
Invert the output of.

The period T of the H signal output from the NOR circuit 34 is ^{T = (2 9 -2 5)} / 48KHz = 10mse
c, therefore, the frequency of the drive voltage applied from the transformer 3 to the vibration compressor 2, that is, the frequency of the AC voltage is 1 / (2 × 1
0) msec = 50 Hz.

Now, the resonance frequency signal input to the 4-bit microprocessor 31 is changed, and the output ports A ₀ to A ₈ of the 4-bit microprocessor 31 are supplied with the signals shown in FIG.
It is assumed that the output port data shown in I) has been set. That is, it is assumed that the output port A ₀ changes from L to H by 1 bit.

At this time, the above H output from the NOR circuit 34
The period T of the signal ^{T = (2 9 -2 5 +1} ) / 48KHz =
10.02 msec, therefore transformer 3 to vibration compressor 2
The frequency of the drive voltage applied to, that is, the frequency of the AC voltage is 1 / (2 × 10.02) msec = 49.89 Hz.

From the above, the 4-bit microprocessor is
Output port A of sensor 31₀Through A ₈Output to set to
Just reset the contents of the port at least once per second
With the frequency accuracy of the drive voltage within 0.2Hz
Can be controlled.

In the above description, the frequency of the driving voltage is 50.
Although the Hz has been described as an example, the frequency of the drive voltage can be controlled with a frequency accuracy within 0.2 Hz with respect to an arbitrary frequency by appropriately selecting the basic clock (CK) to the binary counter 32. .

FIG. 2 shows the construction of another embodiment of the drive system of the vibration compressor according to the present invention, in which the phase control can be easily performed by the combination of a 4-bit microprocessor and a binary counter. Is.

In the figure, the same components as those in FIG. 5 are designated by the same reference numerals, and are denoted by 31, 32, 34, 35,
Reference numeral 37 corresponds to that of FIG. 36 is a switching drive circuit, 38 is an oscillator, and 39 and 40 are AND circuits.

The embodiment shown in FIG. 2 also has basically the same configuration as the conventional example shown in FIG. 5 described at the beginning of the present specification, but it operates at a lower speed than that of the conventional example shown in FIG. The bit microprocessor 31 is capable of controlling the phase. Therefore, the description of the operation overlapping with the conventional example shown in FIG. 5 is omitted, and the operation capable of phase control will be described.

In FIG. 2, when a resonance frequency control signal with a phase control of 80% and 50 Hz is input to the 4-bit microprocessor 31 in FIG. 2, the output ports A ₀ to A ₇ of the 4-bit microprocessor 31 are as shown in FIG. The data of the output port shown in 4 (I) is set. Here, the output ports A ₀ to A ₇ of the 4-bit microprocessor 31 are open collectors,
H in the figure has a possibility of being logically converted in the logic synthesis circuit 37 by the output of the binary counter 32 described later.

On the other hand, a basic clock (CK) of, for example, 30 KHz is sent from the 4-bit microprocessor 31 to the binary counter 32, and the binary counter 32 counts the basic clock of 30 KHz. Each binary output of the binary counter 32 is a logic synthesis circuit 37.
The corresponding output ports A ₀ to A _{7 of the} 4-bit microprocessor 31 through the respective inverter circuits 35 and resistors in the
, The output port of the 4-bit microprocessor 31 is H, and the binary counter 32
When the corresponding binary output of H is H, the H of the output port of the 4-bit microprocessor 31 is converted to logic L.

Therefore, when the binary output of the binary counter 32 has the same logic as the output port of the 4-bit microprocessor 31, that is, the count value, the NOR circuit 3
The H signal is output from 4. This H signal is the AND circuit 3
It is input to each of the input terminals 9, 40.

The oscillator 38 is 50 Hz and 100 H
The z pulse is output in a synchronized form, and the 50 Hz pulse is input to the other input terminal of each of the AND circuits 39 and 40. 50 Hz of the pulse corresponds to 50 Hz of the resonance frequency control signal. That is, the frequency of the drive voltage applied from the transformer 3 to the vibration compressor 2 is determined by the 50 Hz input from the oscillator 38 to the AND circuits 39 and 40.

The 100 Hz pulse generated by the oscillator 38 resets the binary counter 32. The 100 Hz pulse is input to the binary counter 32 as a 30 KHz basic clock (C
It goes without saying that it is synchronized with K).

When the period T of the H signal output from the NOR circuit 34 is calculated, the H signal is output from the NOR circuit 34 when the basic clock (CK) of 30 KHz is 2 ⁸ -2 ^4.
= 240, the period T of the H signal output from the NOR circuit 34 is T = 240 × 1/30
msec.

On the other hand, the period T at which the binary counter 32 is reset by the 100 Hz pulse from the oscillator 38
_{Since 0} is T ₀ = 1/100 sec = 100 msec, the phase control for the data of the output port shown in FIG. 4 (I) is T / T ₀ × 100% = (240 × 1/30)
× 1/10 × 100% = 80%.

Now, the resonance frequency control signal inputted to the 4-bit microprocessor 31 is changed, and the output port data shown in FIG. 4 (II) is output to the output ports A ₀ to A ₇ of the 4-bit microprocessor 31. It shall be set. That is, it is assumed that the output port A ₀ changes from L to H by 1 bit.

At this time, the above H output from the NOR circuit 34
The period T of the signal is 2 ⁸ −2 ⁴ + for the binary counter 32.
Since the H signal is output from the NOR circuit 34 when 1 = 241 basic clocks (CK) are counted, T = 241
× 1/30 msec.

Therefore, the phase control for the data of the output port shown in FIG. 4 (II) is T / T ₀ × 100% = (24
1 × 1/30) × 1/10 × 100% = 80.33%.

From the above, the 4-bit microprocessor is
Output port A of sensor 31₀Through A ₇Output to set to
Reset the data contents of the port at least once a second
The phase control of the drive voltage frequency is
Can be controlled to change by 0.33%.

In the above description, the frequency of the driving voltage is 50
Although the phase control has been described by taking Hz as an example, the oscillator 38
The phase control can be performed at an arbitrary frequency by appropriately selecting the oscillation frequency and the basic clock (CK) input to the binary counter 32.

Therefore, the resonance frequency of the vibration compressor 2 using the resonance of the spring can be changed in a fine step so as to match, and the voltage value thereof can be made constant, so that the vibration compressor 2 is highly versatile. Even a bit microprocessor can be operated most efficiently.

In the above description, instead of the 4-bit microprocessor, 8-bit or 16-bit microprocessors operating at low speed can be naturally used.

[0051]

As described above, according to the present invention, it is possible to easily perform control with high frequency accuracy by combining a low speed microprocessor and a binary counter.

Therefore, the vibration compressor can be efficiently operated by the highly versatile 4-bit microprocessor.

[Brief description of drawings]

FIG. 1 is a configuration of an embodiment of a drive system of a vibration compressor according to the present invention.

FIG. 2 is a configuration of another embodiment of the drive system of the vibration compressor according to the present invention.

FIG. 3 is an explanatory diagram of bit data content of one embodiment set in an output port of a microprocessor.

FIG. 4 is an explanatory diagram of bit data contents of another embodiment set in the output port of the microprocessor.

FIG. 5 is a configuration diagram of a drive control device for a conventional vibration compressor.

FIG. 6 is a configuration diagram of a conventional inverter portion.

[Explanation of symbols]

 1 Control Part 2 Vibration Compressor 14 Drive Circuit 31 4-bit Microprocessor 32 Binary Counter 33 Flip-Flop Circuit 34 NOR Circuit 36 Switching Drive Circuit 37 Logic Synthesis Circuit 38 Oscillator

Claims (2)

[Claims] 1. A temperature detector for detecting a refrigerant temperature, and a drive power of a predetermined frequency determined corresponding to a signal detected by the temperature detector is generated via first and second switching elements. And a control unit for controlling, wherein the vibration type compressor is configured to be driven in a substantially resonant state by using the driving power of a predetermined frequency generated by the control unit. The control unit includes a low-speed microprocessor in which data is set in the output port of the open collector based on the signal detected by the temperature detector, a binary counter for counting a clock of a predetermined frequency, and the open collector. From the data set in the output port and the count content of the binary counter, the data of the bit number corresponding to the above output port A NOR circuit for synthesizing a logic synthesis circuit and a NOR circuit for resetting the binary counter with the output signal of the NOR circuit while taking the NOR of the data corresponding to each output port of the logic synthesis circuit determined by the output of the binary counter. A drive system for a vibration compressor, comprising a drive circuit including a switching drive circuit for operating the first and second switching elements respectively with an output signal, and driving the vibration compressor. 2. A temperature detector for detecting a refrigerant temperature, and a drive power having a predetermined frequency determined corresponding to a signal detected by the temperature detector is generated via the first and second switching elements. And a control unit for controlling, wherein the vibration type compressor is configured to be driven in a substantially resonant state by using the driving power of a predetermined frequency generated by the control unit. The control unit includes a low-speed microprocessor in which data is set in the output port of the open collector based on the signal detected by the temperature detector, a binary counter for counting a clock of a predetermined frequency, and the open collector. From the data set in the output port and the count content of the binary counter, the data of the bit number corresponding to the above output port A NOR circuit for synthesizing a logic synthesis circuit and a NOR circuit for resetting the binary counter with the output signal of the NOR circuit while taking the NOR of the data corresponding to each output port of the logic synthesis circuit determined by the output of the binary counter. Based on the output signal, the first and second
And a drive circuit having a switching drive circuit that resets a binary counter at a predetermined timing while operating each of the switching elements, and drives the vibration compressor. .